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Information on the LM393 Comparator Chip for Use in Robotic Circuits

The figure to om393n right shows the pinout for the LM comparator. When building your own robot on a solderless breadboard, one of the components of the robot will be its brains.

datashwet However, if the first point has a lower l,393n than the second point, the switch is turned off. In a general sense, an analog voltage comparator chip is like a small voltmeter with integrated switches. This makes the LM suitable with a 9 V battery, since this battery has a voltage range of approximately 5 V to 10 V. The datasheet provided for the LM states that it has an optimal voltage range of 2 V to 36 V.


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Terry Ligard is a fourth year mechanical engineering student at the University of Alberta. If the first point has a higher voltage than the second point, the switch is turned on.

The discussion on the LM comparator chip, which is frequently used by robot builders, is directed to those who daatasheet interested in building a light sensing robot, but is still useful for all who wish to incorporate a voltage comparator chip in their robot. It measures voltages at two different points and compares the difference in quantity of voltage.

Terry has several months of experience building electromechanical transporters. Undoubtedly, the most significant information about a comparator chip is how to connect the pins to the rest of the components in a circuit.

Datasheets for the LM can be downloaded here: These are called pins.

If you inspect the LM comparator, you will notice metal wires that stick out. Each voltage comparator chip has a datasheet that includes important information about features of the part and how it is an improvement over previous models of that part. Since the LM comparator chip is too small for an indication of the pins to be printed, the datasheet has an illustrated figure, a pinout, which shows the daatasheet and function of each pin. Although datasheey are different models of voltage comparator chips, I will discuss a very common comparator, the LM Engineers find the datasheet very useful, as it indicates specific aspects of the comparator that were not present before.